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Baseline trans-isthmus interval of 112 ms as measured from the pacing stimuli on electrode 9/10 of the coronary sinus catheter to the atrial electrogram detected by electrode 1/2 on the Halo catheter. In basal conditions the electrical impulse from the coronary sinus ostium spreads with two opposite wave fronts around the tricuspid valve, counterclockwise along the interatrial septum and clockwise along the back edge of the tricuspid.
